JP4414894B2 - A multi-part cooled piston used in internal combustion engines - Google Patents

A multi-part cooled piston used in internal combustion engines Download PDF

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JP4414894B2
JP4414894B2 JP2004557766A JP2004557766A JP4414894B2 JP 4414894 B2 JP4414894 B2 JP 4414894B2 JP 2004557766 A JP2004557766 A JP 2004557766A JP 2004557766 A JP2004557766 A JP 2004557766A JP 4414894 B2 JP4414894 B2 JP 4414894B2
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piston
pin
cooling passage
threaded
internal combustion
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JP2006509152A (en
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シャープ ライナー
メスマー ディーター
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マーレ ゲゼルシヤフト ミツト ベシユレンクテル ハフツング
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Priority to DE10257022A priority Critical patent/DE10257022A1/en
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Priority to PCT/DE2003/003170 priority patent/WO2004053319A1/en
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    • FMECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F02COMBUSTION ENGINES; HOT-GAS OR COMBUSTION-PRODUCT ENGINE PLANTS
    • F02FCYLINDERS, PISTONS OR CASINGS, FOR COMBUSTION ENGINES; ARRANGEMENTS OF SEALINGS IN COMBUSTION ENGINES
    • F02F3/00Pistons 
    • FMECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F02COMBUSTION ENGINES; HOT-GAS OR COMBUSTION-PRODUCT ENGINE PLANTS
    • F02FCYLINDERS, PISTONS OR CASINGS, FOR COMBUSTION ENGINES; ARRANGEMENTS OF SEALINGS IN COMBUSTION ENGINES
    • F02F3/00Pistons 
    • F02F3/16Pistons  having cooling means
    • F02F3/20Pistons  having cooling means the means being a fluid flowing through or along piston
    • F02F3/22Pistons  having cooling means the means being a fluid flowing through or along piston the fluid being liquid
    • FMECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F02COMBUSTION ENGINES; HOT-GAS OR COMBUSTION-PRODUCT ENGINE PLANTS
    • F02FCYLINDERS, PISTONS OR CASINGS, FOR COMBUSTION ENGINES; ARRANGEMENTS OF SEALINGS IN COMBUSTION ENGINES
    • F02F3/00Pistons 
    • F02F3/0015Multi-part pistons
    • F02F3/0023Multi-part pistons the parts being bolted or screwed together

Description

本発明は、請求項1の上位概念部に記載した形式の、内燃機関に用いられる、複数の部分から成る冷却されるピストンに関する。   The invention relates to a cooled piston comprising a plurality of parts for use in an internal combustion engine of the type described in the superordinate concept part of claim 1.
ヨーロッパ特許出願公開第0604223号明細書に基づき、ディーゼル機関に使用される、ピストン上側部分とピストン下側部分とから成るピストンが公知である。ピストン上側部分の中心に設けられたねじ山付きピンと、ピストン下側部分に加工されたねじ山付き孔とを介して、ピストンの組付け時にピストン上側部分がピストン下側部分に螺合される。この場合、永続的な組付け結合部を達成するためには、螺合部をロックナットによって位置固定することが必要となる。この場合、ピストンの組付け時にねじ山付きピンの短い部分しかピンボスの間に現れず、これによって、この部分にロックナットを螺合することが困難となることが欠点である。   A piston consisting of an upper piston part and a lower piston part for use in a diesel engine is known from EP-A-0604223. When the piston is assembled, the piston upper part is screwed to the piston lower part through a threaded pin provided in the center of the piston upper part and a threaded hole machined in the piston lower part. In this case, in order to achieve a permanent assembly coupling portion, it is necessary to fix the position of the threaded portion with a lock nut. In this case, only a short part of the threaded pin appears between the pin bosses when the piston is assembled, which makes it difficult to screw the lock nut into this part.
ここから出発して、本発明の課題は、複数の部分から成る冷却されるピストンの上側部分および下側部分を改良して、ピストン下側部分へのピストン上側部分の簡単な組付けが、ロックナットまたはその他の位置固定手段の付加的な使用なしに可能となるようにすることである。   Starting from here, the object of the present invention is to improve the upper part and the lower part of a cooled piston consisting of several parts, so that a simple assembly of the piston upper part to the piston lower part It is to be possible without the additional use of nuts or other positioning means.
この課題は、請求項1の特徴部に記載した特徴によって解決される。これによって、ピストン下側部分へのピストン上側部分のねじ被せ時にピストン下側部分の、ねじ山付き孔を備えた肉薄の領域が皿ばね状に膨らみ上がるので、これによって、ピストンの組付け後にねじ山付きピンに、ピストン上側部分とピストン下側部分との間の永続的な組付け結合部を生ぜしめる引張り応力が加えられることが達成される。   This problem is solved by the features described in the characterizing part of claim 1. This causes a thin area with a threaded hole in the lower part of the piston to bulge in the shape of a disc spring when the upper part of the piston is screwed onto the lower part of the piston. It is achieved that the crested pin is subjected to a tensile stress that creates a permanent assembly connection between the piston upper part and the piston lower part.
以下に、本発明の実施例を図面につき詳しく説明する。   In the following, embodiments of the invention will be described in detail with reference to the drawings.
図1には、複数の部分から成る冷却されるピストン1、つまり、冷却式の組立形ピストン1が示してある。このピストン1は、燃焼キャビティ3と、リング部分5を備えたリング壁4とを有するピストン上側部分2と、ピストン下側部分6とから成っている。このピストン下側部分6は、ボックス状のピストンスカート7と、このピストンスカート7に結合された、ピストンピン(図示せず)を収容するためのそれぞれ1つのピン孔9を備えた2つのピンボス8とを有している。ピストン上側部分2とピストン下側部分6とは、外側の環状の冷却通路10と、この冷却通路10に対して同心的に配置された内側の冷却通路11と仕切っている。この場合、外側の冷却通路10は、冷却油を導入するための少なくとも1つの流入開口12を有していて、少なくとも1つのオーバフロー通路13を介して内側の冷却通路11に接続されている。オーバフロー通路13は孔として形成されていてよい。この場合、たとえば、互いに反対の側に位置する2つのオーバフロー通路13が設けられていてよい。内側の冷却通路11は少なくとも1つの流出孔14を有している。この冷却孔14を介して、冷却油が内側の冷却通路11から流出することができる。   FIG. 1 shows a piston 1 to be cooled which consists of a plurality of parts, that is to say a cooled assembly piston 1. The piston 1 comprises a piston upper part 2 having a combustion cavity 3 and a ring wall 4 with a ring part 5, and a piston lower part 6. The lower piston portion 6 has a box-shaped piston skirt 7 and two pin bosses 8 each having a pin hole 9 connected to the piston skirt 7 for receiving a piston pin (not shown). And have. The piston upper portion 2 and the piston lower portion 6 partition the outer annular cooling passage 10 and the inner cooling passage 11 disposed concentrically with the cooling passage 10. In this case, the outer cooling passage 10 has at least one inflow opening 12 for introducing cooling oil, and is connected to the inner cooling passage 11 via at least one overflow passage 13. The overflow passage 13 may be formed as a hole. In this case, for example, two overflow passages 13 located on opposite sides may be provided. The inner cooling passage 11 has at least one outflow hole 14. Through this cooling hole 14, the cooling oil can flow out from the inner cooling passage 11.
この場合、ピストン上側部分2は、一方では、このピストン上側部分2の、燃焼キャビティ3と反対の側に配置された環状の載着面15を介してピストン下側部分6の環状の支持リブ17の上側の載着面16に支承されていて、他方では、リング壁4の下側に位置する横断面18を介してピストン下側部分6の環状の支持ウェブ20の上側の横断面19に支承されている。この場合、両載着面15,16は、平らなかつ水平に配置されたかもしくは屋根状にまたは皿状に形成された内側の載着部21を形成しており、両横断面18,19は、内側の載着部21に対して同軸的にかつ水平に配置されたかもしくは同じく屋根状にまたは皿状に形成された外側の載着部22を形成している。   In this case, the piston upper part 2 is on the one hand an annular support rib 17 of the piston lower part 6 via an annular mounting surface 15 arranged on the opposite side of the piston cavity 2 from the combustion cavity 3. Is supported on the upper mounting surface 16 and on the other hand on the upper cross section 19 of the annular support web 20 of the piston lower part 6 via the cross section 18 located below the ring wall 4. Has been. In this case, both mounting surfaces 15 and 16 form an inner mounting portion 21 which is flat and horizontally arranged or is formed in a roof shape or a dish shape. The outer mounting portion 22 is formed coaxially and horizontally with respect to the inner mounting portion 21 or is also formed in a roof shape or a dish shape.
支持ウェブ20は段状に形成されているので、ピストン上側部分2は、リング壁4の下側の部分の内面に加工された円筒状の切欠き23を介して、ピストン上側部分とピストン下側部分との組立て時に円筒状の切欠き23の内壁が支持ウェブ20の円筒状の端面24に接触することによってセンタリングすることができる。この場合、下側部分6への上側部分2の問題なしの組付けが保証されているような誤差寸法だけ、円筒状の切欠き23の内径が支持ウェブ20の円筒状の端面24の外径よりも大きいことが必要となる。   Since the support web 20 is formed in a step shape, the piston upper portion 2 is connected to the piston upper portion and the piston lower portion via a cylindrical notch 23 processed on the inner surface of the lower portion of the ring wall 4. It can be centered by the inner wall of the cylindrical notch 23 contacting the cylindrical end face 24 of the support web 20 during assembly with the part. In this case, the inner diameter of the cylindrical notch 23 is equal to the outer diameter of the cylindrical end surface 24 of the support web 20 by an error dimension that ensures a problem-free assembly of the upper portion 2 to the lower portion 6. It is necessary to be larger than.
燃焼キャビティ3と反対の側にピストン上側部分2は、中心にかつピストン1の長手方向軸線25に対して同軸的に配置されたピン26を有している。このピン26の端部27はねじ山28を備えている。ピストン上側部分2と一緒に内側の冷却通路11を仕切るピストン下側部分6の環状の支持リブ17の間の領域31は比較的肉薄に形成されていて、その中心に、ピストン1の長手方向軸線25に対して同軸的に配置された孔29を備えている。この孔29は、ピン26のねじ山28に嵌合する雌ねじ山30を有している。   On the opposite side of the combustion cavity 3, the piston upper part 2 has a pin 26 arranged centrally and coaxially with the longitudinal axis 25 of the piston 1. The end 27 of the pin 26 has a thread 28. A region 31 between the annular support ribs 17 of the lower piston portion 6 that partitions the inner cooling passage 11 together with the upper piston portion 2 is formed relatively thin, and the longitudinal axis of the piston 1 is at the center thereof. A hole 29 arranged coaxially with respect to 25 is provided. The hole 29 has an internal thread 30 that fits into the thread 28 of the pin 26.
これによって、ピストン1の組付け時にピストン上側部分2のねじ山付きピン26さえ領域31のねじ山付き孔29内にねじ込まれればよいことが可能となる。この場合、比較的肉薄の領域31の弾性によって、この領域31がピストン上側部分とピストン下側部分との螺合による組立て時に皿ばねのように変形しかつ領域31の、ねじ山付き孔29を備えた内側の中心部がピストン上側部分2の方向に膨らみ上がる。付加的には、組付け時にねじ山付きピン26のねじ山なしの減径軸部もしくは疲れ防止軸部が延長される。これによって、ピストン下側部分6へのピストン上側部分2の座りの確実性のさらなる改善が達成される。この場合、内側の載着部21の載着面15,16だけでなく、外側の載着部22の横断面18,19も互いに押し着けられる。これによって、内側のかつ外側の冷却通路10,11がシールされる。これによって、付加的なナットもしくはロックナットが永続的な組付け結合部を達成するために不要となるほど十分にピストン上側部分とピストン下側部分との組付けの強度が増加させられる。考えられ得る全ての運転条件下で、ピストンの両部分の十分な予荷重もしくはプレロードが保証されていることが試してみて分かった。   This makes it possible for even the threaded pin 26 of the piston upper part 2 to be screwed into the threaded hole 29 of the region 31 when the piston 1 is assembled. In this case, due to the elasticity of the relatively thin region 31, this region 31 is deformed like a disc spring when assembled by screwing the piston upper portion and the piston lower portion, and the threaded hole 29 in the region 31 is formed. The inner central part provided swells in the direction of the piston upper part 2. In addition, the unreduced reduced diameter shaft portion or the fatigue prevention shaft portion of the threaded pin 26 is extended during assembly. Thereby, a further improvement in the certainty of the sitting of the piston upper part 2 on the piston lower part 6 is achieved. In this case, not only the mounting surfaces 15 and 16 of the inner mounting portion 21 but also the cross sections 18 and 19 of the outer mounting portion 22 are pressed against each other. As a result, the inner and outer cooling passages 10, 11 are sealed. This increases the strength of the assembly of the piston upper part and the piston lower part sufficiently such that no additional nuts or locknuts are needed to achieve a permanent assembly connection. It has been tried and found that sufficient preloading or preloading of both parts of the piston is guaranteed under all possible operating conditions.
ピストン上側部分2は、耐酸化性のかつ/または耐熱性の材料から成っていてよい。一般的には、4%以上クロムを含有した鋼が使用される。この鋼は、DIN EN 10027−2(鋼グループ−番号1.4x xx)による化学的に安定した鋼の材料グループ、たとえば耐熱性のステンレス鋼と、合金化された工具鋼の材料グループ、たとえば合金化された熱間加工鋼とから成っている。   The piston upper part 2 may be made of an oxidation-resistant and / or heat-resistant material. Generally, steel containing 4% or more chromium is used. This steel consists of a chemically stable steel material group according to DIN EN 1000027-2 (steel group-number 1.4x xx), for example a heat-resistant stainless steel, and an alloyed tool steel material group, for example an alloy. Made of heat-treated steel.
ピストン下側部分6は、析出硬化型のフェライト系〜パーライト系の鋼または熱処理鋼から成っている。この場合、一般的には、(ドイツの鋼−鉄材料表101による)鋼品質38MnVS6または42CrMo4が使用される。   The lower piston portion 6 is made of precipitation hardening type ferritic to pearlite steel or heat treated steel. In this case, the steel quality 38MnVS6 or 42CrMo4 is generally used (according to German steel-iron material table 101).
本発明によるピストンの断面図であり、左側の半部は、ピン方向で見たピストンの半割断面図であり、右側の半部は、側圧−反側圧方向で見たピストンの半割断面図である。1 is a sectional view of a piston according to the present invention, a left half is a half sectional view of a piston viewed in a pin direction, and a right half is a half sectional view of a piston viewed in a lateral pressure-opposite pressure direction. It is.
符号の説明Explanation of symbols
1 ピストン、 2 ピストン上側部分、 3 燃焼キャビティ、 4 リング壁、 5 リング部分、 6 ピストン下側部分、 7 ピストンスカート、 8 ピンボス、 9 ピン孔、 10 冷却通路、 11 冷却通路、 12 流入開口、 13 オーバフロー通路、 14 流出孔、 15 載着面、 16 載着面、 17 支持リブ、 18 横断面、 19 横断面、 20 支持ウェブ、 21 載着部、 22 載着部、 23 切欠き、 24 端面、 25 長手方向軸線、 26 ねじ山付きピン、 27 端部、 28 ねじ山、 29 ねじ山付き孔、 30 雌ねじ山、 31 領域   DESCRIPTION OF SYMBOLS 1 piston, 2 piston upper part, 3 combustion cavity, 4 ring wall, 5 ring part, 6 piston lower part, 7 piston skirt, 8 pin boss, 9 pin hole, 10 cooling passage, 11 cooling passage, 12 inflow opening, 13 Overflow passageway, 14 outflow hole, 15 mounting surface, 16 mounting surface, 17 support rib, 18 cross section, 19 cross section, 20 support web, 21 mounting portion, 22 mounting portion, 23 notch, 24 end surface, 25 Longitudinal axis, 26 Threaded pin, 27 End, 28 Thread, 29 Threaded hole, 30 Female thread, 31 Area

Claims (1)

  1. 内燃機関に用いられる、複数の部分から成る冷却されるピストン(1)であって、リング壁(4)およびリング部分(5)を備えたピストン上側部分(2)と、ピストン下側部分(6)とが設けられており、該ピストン下側部分(6)が、ピストン上側部分(2)と共に外側の環状の冷却通路(10)と、さらに、該冷却通路(10)に対して同心的に配置された内側の環状の冷却通路(11)とを形成しており、ピストン下側部分(6)が、結合された2つのピンボス(8)を備えたボックス状のピストンスカート(7)を有しており、ピストン上側部分(2)が、ピストン下側部分(6)に面した側に、当該ピストン(1)の長手方向軸線(25)に対して同軸的に配置されたねじ山付きピン(26)を有しており、ピストン下側部分(6)が、ピストン上側部分(2)に面した側に、ピストン長手方向軸線(25)に対して同軸的に配置された、ねじ山付きピン(26)のねじ山(28)に嵌合する雌ねじ山(30)を備えたねじ山付き孔(29)を有しており、ピストン上側部分(2)とピストン下側部分(6)との組付けのために、ねじ山付きピン(26)がねじ山付き孔(29)内にねじ込み可能であるように、ねじ山付きピン(26)とねじ山付き孔(29)とが配置されている形式のものにおいて、
    ねじ山付きピン(26)が、内側の冷却通路(11)の内側の仕切りを形成しており、ピストン下側部分(6)の、内側の冷却通路(11)をカバーする領域(31)が、ねじ山付き孔(29)を有していて、皿ばね状に変形可能であるように、肉薄に形成されていることを特徴とする、内燃機関に用いられる、複数の部分から成る冷却されるピストン。
    A piston to be cooled (1) consisting of a plurality of parts for use in an internal combustion engine, comprising a piston upper part (2) with a ring wall (4) and a ring part (5), and a piston lower part (6 The piston lower part (6) is concentric with the piston upper part (2) and the outer annular cooling passage (10), and further concentric with the cooling passage (10). A piston-shaped piston skirt (7) with two pin bosses (8) joined to each other. A threaded pin in which the piston upper part (2) is arranged coaxially with respect to the longitudinal axis (25) of the piston (1) on the side facing the piston lower part (6) (26) and the piston lower part ( ) Is fitted on the thread (28) of the threaded pin (26) arranged coaxially with respect to the piston longitudinal axis (25) on the side facing the piston upper part (2) A threaded hole (29) with a thread (30), for the assembly of the piston upper part (2) and the piston lower part (6), a threaded pin (26) In the type in which the threaded pin (26) and the threaded hole (29) are arranged so that they can be screwed into the threaded hole (29),
    The threaded pin (26) forms the inner partition of the inner cooling passage (11) and the region (31) covering the inner cooling passage (11) of the piston lower part (6). A multi-part cooled portion used in an internal combustion engine, characterized in that it has a threaded hole (29) and is thinly formed so that it can be deformed into a disc spring shape. Piston.
JP2004557766A 2002-12-06 2003-09-24 A multi-part cooled piston used in internal combustion engines Expired - Fee Related JP4414894B2 (en)

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DE10257022A DE10257022A1 (en) 2002-12-06 2002-12-06 Multi-part cooled piston for an internal combustion engine
PCT/DE2003/003170 WO2004053319A1 (en) 2002-12-06 2003-09-24 Multipart cooled piston for an internal combustion engine

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JP2006509152A JP2006509152A (en) 2006-03-16
JP4414894B2 true JP4414894B2 (en) 2010-02-10

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EP (1) EP1583896B1 (en)
JP (1) JP4414894B2 (en)
KR (1) KR101067577B1 (en)
CN (1) CN100339584C (en)
BR (2) BR0317030A (en)
DE (2) DE10257022A1 (en)
HK (1) HK1084169A1 (en)
RU (1) RU2313679C2 (en)
WO (1) WO2004053319A1 (en)

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BR0310142B1 (en) 2013-02-19
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HK1084169A1 (en) 2006-07-21
CN100339584C (en) 2007-09-26
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CN1714232A (en) 2005-12-28
US6729291B1 (en) 2004-05-04
DE10257022A1 (en) 2004-06-17
EP1583896A1 (en) 2005-10-12
KR101067577B1 (en) 2011-09-27
RU2005121255A (en) 2006-06-10
JP2006509152A (en) 2006-03-16
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WO2004053319A1 (en) 2004-06-24
RU2313679C2 (en) 2007-12-27

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